According to the answer key, only 29 percent of people got this correct. Correct answer is A. But how?

I think this can be proven with the law of cosines, but that is out of the scope of the test.

According to the answer key, only 29 percent of people got this correct. Correct answer is A. But how?

I think this can be proven with the law of cosines, but that is out of the scope of the test.

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I think its much simpler than that there is a property of obtuse triangle

Let a, b and c are the lengths of the sides of triangle ABC and c is the largest side, then the triangle is obtuse if

a2 + b2 < c2

Does a2 mean a^2 here?

Yeah sorry for the typo